This "Mode" is for the "old" school Tally Advance that was used on a Deko.
For the users that use the more traditional key on key off type work flow it will send the NEXT -- depending on the XPression model and video mode you set it to like 5-7 frames of pre-roll so that it will send the command advance the sequencer and then the key goes on.
Normally this is also clearing the previous graphic.
When you work with the multi layering workflow this is no longer really usable and you will manage everything via Custom Controls
Les
#Carbonite